Journal Title
Title of Journal: J Plant Res
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Abbravation: Journal of Plant Research
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Authors: Masaki Uchida Ayaka Kishimoto Hiroyuki Muraoka Takayuki Nakatsubo Hiroshi Kanda Hiroshi Koizumi
Publish Date: 2009/09/17
Volume: 123, Issue: 1, Pages: 79-
Abstract
We examined factors controlling temporal changes in net ecosystem production NEP in a high Arctic polar semidesert ecosystem in the snowfree season We examined the relationships between NEP and biotic and abiotic factors in a dominant plant community Salix polaris–moss in the Norwegian high Arctic Just after snowmelt in early July the ecosystem released CO2 into the atmosphere A few days after snowmelt however the ecosystem became a CO2 sink as the leaves of S polaris developed Diurnal changes in NEP mirrored changes in light incidence photosynthetic photon flux density PPFD in summer NEP was significantly correlated with PPFD when S polaris had fully developed leaves ie high photosynthetic activity In autumn NEP values decreased as S polaris underwent senescence During this time CO2 was sometimes released into the atmosphere In wet conditions moss made a larger contribution to NEP In fact the water content of the moss regulated NEP during autumn Our results indicate that the main factors controlling NEP in summer are coverage and growth of S polaris PPFD and precipitation In autumn the main factor controlling NEP is moss water contentThis work was supported by a GrantinAid for Scientific Research on Priority Areas from the Ministry of Education Culture Sports Science and Technology of Japan and a GrantinAid for Scientific Research from the Japan Society for the Promotion of Science We thank H Koike at Meiwafosis Co Ltd Tokyo for technical support in the development of the NEP chamber Thanks are also due to the anonymous reviewer for respectful comments on our manuscript
Keywords:
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